Read for BI393: Biostatistics. A solid introduction to biological research. Long-hand examples could be argued as unnecessary in the age of statistical software programs, but theoretical background is important.
This book was an absolute god-send during my studies. If you've no head for maths and have to use them this is definitely the book for you. It's clearly written and details what each method is best used for and gives easy to follow examples. This book was always beside my computer throughout my studies and I keep it handy even now.
Even after so many years I still find this book immensely useful. But now with the advent of so many easy to use stats software this is now better as a reference guide than a means of working these out by hand (thankfully as those tables are scary!).